- do not use +=, older bash versions do not support it

diff --git a/build b/build
index 62b1b24..91484f5 100755 (executable)
--- a/build
+++ b/build
@@ -768,7 +768,7 @@ while test -n "$1"; do
       ;;
       *-oldpackages)
        needarg
-       old_packages+=("$ARG")
+       old_packages=("${old_packages[@]}" "$ARG")
        shift
       ;;
       *-dist)
@@ -1433,18 +1433,18 @@ for SPECFILE in "${SPECFILES[@]}" ; do
                if [ "$kvm_virtio" = 1 ]; then
                    qemu_args=(-drive file="$VM_IMAGE",if=virtio -hda "$VM_IMAGE")
                    if [ -n "$VM_SWAP" ]; then
-                       qemu_args+=("-drive")
-                       qemu_args+=("file=$VM_SWAP,if=virtio")
+                       qemu_args=("${qemu_args[@]}" "-drive")
+                       qemu_args=("${qemu_args[@]}" "file=$VM_SWAP,if=virtio")
                    fi
                else
                    qemu_args=(-hda "$VM_IMAGE")
                    if [ -n "$VM_SWAP" ]; then
-                       qemu_args+=("-hdb")
-                       qemu_args+=("$VM_SWAP")
+                       qemu_args=("${qemu_args[@]}" "-hdb")
+                       qemu_args=("${qemu_args[@]}" "$VM_SWAP")
                    fi
                fi
                if [ -n "$BUILD_JOBS" -a "$icecream" = 0 ]; then
-                   qemu_args+=("-smp" "$BUILD_JOBS")
+                   qemu_args=("${qemu_args[@]}" "-smp" "$BUILD_JOBS")
                fi
 
                set -- $qemu_bin -no-reboot -nographic -net none \